Rare cells can be identified within mixed cell populations with near perfect accuracy using a detection technique devised by research teams led by Robert Wieder, MD, PhD, at the University of Medicine and Dentistry of New Jersey-New Jersey Medical School and Rajan Kumar, MD, PhD, at Genome Data Systems in Hamilton, N.J. This technique may facilitate cancer diagnosis, which often relies on the detection of rare cancerous cells in tiny amounts of biopsy tissue or fluid.